Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Experimental methods and magnetic imaging

MA 30.9: Vortrag

Mittwoch, 2. April 2014, 17:15–17:30, HSZ 403

Magnetic imaging using a scanning single qubit and optimal control — •Thomas Häberle¹, Dominik Schmid-Lorch¹, Khaled Karrai², Friedemann Reinhard¹, and Jörg Wrachtrup¹ — ¹3. Physikalisches Institut and Stuttgart Research Center of Photonic Engineering (SCoPE), Universität Stuttgart, Germany — ²attocube systems AG, Munich, Germany

We present a novel scanning probe technique for magnetic field microscopy that promises a higher spatial resolution than standard MFM [1]. The new scanning probe is the nitrogen-vacancy (NV)-color center in diamond, which can be employed as an atom-sized magnetic field sensor by monitoring the Zeeman-shift of its spin sublevels [2-3].

I will present benchmark measurements on magnetic nanostructures, in particular a quantitative mapping of the field produced by an MFM-tip. These results were used to validate analytical models proposed for quantitative MFM [4]. Furthermore, I will explain the advanced spectroscopy protocol that was applied in the measurements. It is based on optimal control and enables fast acquisition of strongly varying magnetic field gradients with quantum-limited sensitivity [5].

[1] G. Balasubramanian et al., Nature Vol 455, 648-651 (2008)

[2] L. Rondin et al., Appl. Phys. Lett.. Vol. 100, 153118 (2012)

[3] P. Maletinsky et al., Nat. Nanotech. Vol. 7, 320-4 (2012)

[4] T. Häberle et al., New J. Phys. Vol. 14, 043044 (2012)

[5] T. Häberle et al., Phys. Rev. Lett. Vol. 111, 170801 (2013)